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Submitted on: 16 July 2020.
Revised on: 27 October 2020.
Accepted on: 19 November 2020.
___________________CHINESE PHYSICS LETTERS---IOP PUBLISHING LTD
Submitted on: 14 November 2015.
Revised on: 19 January 2016.
Accepted on: 21 February 2016.
___________________CHINESE PHYSICS LETTERS---IOP PUBLISHING LTD
Submitted on: 05 March 2005.
Revised on: 27 March 2005.
Accepted on: 25 May 2005.
___________________CHINESE PHYSICS LETTERS---IOP PUBLISHING LTD
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